Double free in Linux kernel - CVE-2026-46079
Published: May 27, 2026
Vulnerability identifier: #VU132407
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46079
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a double free in the rbd device add error-handling path when handling a failure after device_add() succeeds but device_add_disk() fails. A local user can trigger the vulnerable teardown sequence by writing to /sys/bus/rbd/add_single_major to cause a denial of service.
Exploitation was reproduced when fault injection was confined to the __add_disk() range.
How to mitigate CVE-2026-46079
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/059fb7656723c1b77c2fc0e64b7aa99d6bb65e8e
- https://git.kernel.org/stable/c/2f4809a879f0750c7790bbeeae86c9505797a06f
- https://git.kernel.org/stable/c/564cd8f4aeb9a938e470c5c91922fd02e4d41acc
- https://git.kernel.org/stable/c/ad0126ffcba8777109852979eaaa6dca6703abdb
- https://git.kernel.org/stable/c/d1fef92e414433ca7b89abf85cb0df42b8d475eb